Apparatus, method, and program for selecting image data using a display

ABSTRACT

An image recording apparatus includes an image capturing unit configured to capture an image of a subject, a recording unit configured to record one of still image data and video image data captured by the image capturing unit on a storage medium in the form of an image file, a generating unit configured to generate a management file used for managing the image file recorded on the storage medium, and a registering unit configured to register an identifier of the image file recorded on the storage medium in the management file on a capture date basis in the order of capture time.

CROSS REFERENCES TO RELATED APPLICATIONS

This application is a divisional of U.S. application Ser. No.12/948,130, filed on Nov. 17, 2010, which is a continuation ofapplication Ser. No. 11/637,685, filed on Dec. 12, 2006, which claimspriority from Japanese Patent Application JP 2005-380371 filed in theJapanese Patent Office on Dec. 28, 2005, the entire contents of whichare incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an apparatus, a method, and a programfor recording an image and, in particular, to a method, and a programfor recording an image suitable for managing images captured by, forexample, a video camera.

2. Description of the Related Art

Existing video cameras employ a tape storage medium and successivelyrecord captured images on the tape storage medium. Accordingly, a userstores the images on a tape medium. To view the images stored on thetape storage medium, the user needs to search for a desired image byplaying back the images in the order in which they were captured.

In recent years, video cameras that record images on, for example, astorage medium that allows random access (such as a hard disk) have beenintroduced into market. In addition, to manage images recorded in suchvideo cameras, a technology is proposed in which the images are dividedinto small groups based on a minimum unit of data required for accessingthe data (refer to, for example, Japanese Unexamined Patent ApplicationPublication No. 2000-270347).

According to such a management method, the maintenance of images storedon the tape storage medium is not needed, and therefore, the search fordesired scene in the images by playing back the images in the tapestorage medium in the order in which they were captured is not needed.

SUMMARY OF THE INVENTION

However, since the users are not familiar with the grouping of theimages in such a management method, the users feel confused orfrustrated when editing the captured data.

Accordingly, the present invention provides an apparatus, a method, anda program capable of managing files recorded on the storage medium in avariety of aspects in a user-friendly manner.

According to an embodiment of the present invention, an image recordingapparatus includes image capturing means for capturing an image of asubject, recording means for recording one of still image data and videoimage data captured by the image capturing means on a storage medium inthe form of an image file, generating means for generating a managementfile used for managing the image file recorded on the storage medium,and registering means for registering an identifier of the image filerecorded on the storage medium in the management file on a capture datebasis in the order of capture time.

Accordingly, this image recording apparatus can automatically groupimage files on a capture date basis, which usually corresponds to apersonal event, for each type of image file. Consequently, this imagerecording apparatus can manage the image files more effectively thanimage recording apparatuses that simply manage the image files on ascene-to-scene basis.

According to another embodiment of the present invention, a method forrecording an image includes the steps of (a) capturing an image of asubject, (b) recording one of still image data and video image datacaptured in step (a) on a storage medium in the form of an image file,(c) generating a management file used for managing the image filerecorded on the storage medium, and (d) registering an identifier of theimage file recorded on the storage medium in the management file on acapture date basis in the order of capture time.

Accordingly, the method according to the embodiment can automaticallygroup the image files on a capture date basis for each type of file. Ingeneral, personal events occur on the basis of a date. Therefore, theimage files can be effectively managed compared with simply recording ona scene-to-scene basis.

According to still another embodiment of the present invention, aprogram, executed by a computer, includes program code for performingthe steps of (a) controlling image capturing means to capture an imageof a subject, (b) controlling recording means to record one of stillimage data and video image data captured by the image capturing means ona storage medium in the form of an image file, (c) generating amanagement file used for managing the image file recorded on the storagemedium, and (d) registering an identifier of the image file recorded onthe storage medium in the management file on a capture date basis in theorder of capture time.

Accordingly, the program according to the embodiment can automaticallygroup the image files on a capture date basis for each type of file. Ingeneral, personal events occur on the basis of a date. Therefore, theimage files can be effectively managed compared with simply recording ona scene-to-scene basis.

According to the embodiments of the present invention, the identifiersof image files recorded on a storage medium are registered in amanagement file on a capture date basis in the order of capture time.Consequently, the image files can be automatically grouped on a capturedate basis for each type of file. In general, personal events occur onthe basis of a date. Therefore, the image files can be effectivelymanaged compared with simply recording on a scene-to-scene basis. As aresult, an apparatus, a method, and a program for recording an image canbe achieved that are capable of managing files recorded on the storagemedium in a variety of aspects in a user-friendly manner.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of a video camera according to an embodimentof the present invention;

FIG. 2 is a schematic illustration of the structure of an imagemanagement file;

FIG. 3 is a schematic illustration of the recording physical structureof the image management file;

FIG. 4 illustrates an exemplary selection screen;

FIG. 5 is a flow chart of the entry processing of a playlist on acapture date basis;

FIGS. 6A and 6B are diagrams illustrating displayed images and a processfor registering a file in the playlist;

FIG. 7 illustrates an exemplary edit menu screen;

FIG. 8 illustrates an exemplary date selection screen;

FIG. 9 illustrates an exemplary confirmation screen;

FIG. 10 is a diagram illustrating a playlist screen; and

FIG. 11 is a diagram illustrating an edit operation of the playlist.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Embodiments of the present invention are described below with referenceto the accompanying drawings.

(1) Overall Configuration of Video Recording Apparatus According to thePresent Embodiment

FIG. 1 illustrates the overall structure of a video camera 1 accordingto the present embodiment. The video camera 1 includes a control unit 2for performing overall control of the video camera 1. The video camera 1further includes an operation unit 3, an image capturing unit 4, arecording/playback unit 5, a display unit 6, and a clock unit 7, eachbeing connected to the control unit 2.

The control unit 2 is a computer including a central processing unit(CPU), a read only memory (ROM) storing a variety of programs, and arandom access memory (RAM) serving as a work memory of the CPU. Avariety of commands COM corresponding to user operations is provided tothe control unit 2.

The control unit 2 identifies the user operation on the basis of theprovided command COM and, subsequently, performs an operation on thebasis of the identified user operation and a program corresponding tothe identified user operation.

(1-1) Image Capturing Mode

More specifically, upon detecting a user operation to start capturingvideo, the control unit 2 controls the image capturing unit 4 and therecording/playback unit 5 to change the operation mode of the videocamera 1 to a video capturing mode until the video capturing operationis completed.

In this case, the image capturing unit 4 captures the image of a subjectat a predetermined interval from the time the control unit 2 detects theoperation to start capturing video to the time the video capturingoperation is completed so as to obtain image data items DM1 to DMn(where n is an integer) and sequentially delivers the image data itemsDM1 to DMn to the control unit 2.

The recording/playback unit 5 encodes the image data items DM1 to DMnsequentially delivered from the image capturing unit 4 via the controlunit 2 in accordance with a predetermined encoding method, such as theMoving Picture Experts Group (MPEG) standard. Thereafter, therecording/playback unit 5 records video files DMFx (x=1, 2, 3, . . . m,where m is an integer), which are encoded image data items obtainedthrough the encoding operation, on a storage medium SM mounted at apredetermined location of the video camera 1.

In contrast, upon detecting the user operation to start capturing astill image, the control unit 2 controls the image capturing unit 4 andthe recording/playback unit 5 to change the operation mode of the videocamera 1 to a still image capturing mode.

In this case, the image capturing unit 4 captures the image of a subjectat the time when a user operation to capture a still image is carriedout and, subsequently, delivers image data DJ obtained through thecapture operation to the control unit 2. The recording/playback unit 5encodes the image data DJ delivered from the image capturing unit 4 viathe control unit 2 in accordance with a predetermined encoding method,such as the Joint Photographic Experts Group (JPEG) standard.Thereafter, the recording/playback unit 5 records the encoded image dataon a storage medium SM in the form of a still image file DJFy (y=1, 2,3, . . . l, where l is an integer).

In this way, the control unit 2 can record an image captured at the timeperformance of the operation to capture a still image is instructed by auser or record an image captured during the period from the timeperformance of operation to start capturing video is instructed by auser to the time performance of operation to complete capturing video(hereinafter, the image is referred to as a “scene”) is instructed by auser onto the storage medium SM in the form of an individual file.

Here, each of the files recorded on the storage medium SM includes dateand time information generated by the built-in clock of the control unit2 at the time of image capture. Thus, even when the video files DMFx orstill image files DJFy recorded on the same day are present, the controlunit 2 can identify the order in which the images were captured byreferencing the capture times in the date and time information includedin the files.

(1-2) Playback Mode

Upon detecting instruction of the operation to play back a video file ora still image file, the control unit 2 controls the image capturing unit4 and the recording/playback unit 5 to change the operation mode of thevideo camera 1 to a playback mode.

In this case, the recording/playback unit 5 reads out a file IMspecified by the command COM received from the operation unit 3 fromamong the video files DMFx (x=1−m) or the still image files DJFy (y=1−l)recorded on the storage medium SM.

Subsequently, the recording/playback unit 5 carries out the decodingoperation corresponding to the compression encoding method on thereadout file IM and delivers the decoded image data DR to the controlunit 2.

The display unit 6 digital-to-analog (D/A) converts the image data DRsequentially delivered from the recording/playback unit 5 via thecontrol unit 2 so as to generate image signals. The display unit 6 thendisplays images on a display screen on the basis of the generated imagesignals.

Thus, the control unit 2 can play back the images of the video file orthe image of the still image file determined depending on the useroperation.

(2) Date Management Function

In addition to the above-described configuration, the video camera 1 hasa function of managing images of the video files DMFx and the stillimage files DJFy on the basis of capture date. In practice, the videofiles DMFx and the still image files DJFy in the video camera 1 aremanaged on a capture date basis using an image management file.

(2-1) Structure of Image Management File

As shown in FIG. 2, the image management file has a layered structureknown as a tree structure, which has a root directory called an “indexroot”. The index root is the highest layer. As the lower layers, thistree structure has a folder called an “original root folder”(hereinafter simply referred to as an “original folder”) and a foldercalled a “favorite root folder” (hereinafter simply referred to as a“favorite folder”).

These root folder, original folder, and favorite folder are created bythe control unit 2 when no data are stored on the storage medium SM, forexample, when the storage medium SM is formatted or the storage mediumSM without any data thereon is mounted at a predetermined mountinglocation.

A folder having a folder title in a date format (hereinafter referred toas a “date folder”) is stored in the original folder. Storing of thedate folder in the original folder is referred to as an “entry”. Foldersthat each store information about the files recorded on the storagemedium SM on the same date are entered into the date folder in the orderof oldest to newest for the scene. Hereinafter, this folder is referredto as a “file information folder”.

More specifically, for the video files DMFx, the file information folderincludes path information to a thumbnail image that is a reduced imageof a representative image among a plurality of images of the video filesDMFx (see an arrow from the property file to the thumbnail file shown inFIG. 3), path information to the video file DMFx (i.e., information foraccessing a video file entity), and path information to attributeinformation about the video file DMFx (not shown). In contrast, for thestill image files DJFy, the file information folder includes pathinformation to a thumbnail image of the still image file DJFy, pathinformation to the still image files DJFy, and path information toattribute information about the still image file DJFy (not shown). Notethat the path information is only an example of information foraccessing a variety of the above-described information. The files andthe information may be identified using an identifier, such as a filenumber or a file name.

In an example shown in FIG. 2, each of reference symbols “A”, “B”, and“C” denotes a thumbnail image. Each of the folder titles “Food”, “Food2”, and “My Cat” denotes the file identifier. It should be noted thatthe user can change these folder titles through an edit operation.

In this way, the information (file information) about images capturedfor a scene is sequentially entered into the original folder on thebasis of capture date in the order of oldest to newest.

In the video camera 1, the “date” is used only for grouping the fileinformation and the file information is entered in the order in whichimages are captured. Accordingly, even when the built-in clock of thevideo camera 1 gains or loses time, a problem that affects themanagement does not occur.

In contrast, the favorite folder includes two types of folder selectedfrom among one or more file information folders in the lower layer ofthe date folder: a folder (hereinafter referred to as a “video playlistfolder”) that stores information about the video files DMFx selected tobe continuously played back and a folder (hereinafter referred to as a“still image playlist folder”) that stores information about the stillimage files DJFy selected to be continuously played back. Like the rootfolder, these folders are generated by the control unit 2 when no dataare recorded on the storage medium SM.

Link information to the file information folder corresponding to thefile selected to be continuously played back is sequentially enteredinto one of these folders in the selected order.

In the example shown in FIG. 2, the link information to the fileinformation folder “My Cat” corresponding to the file stored in thefolder “2005/4/5” and the link information to the file informationfolder “Food”, which is one of the file information folders “Food” and“Food 2” corresponding to the file stored in the folder “2005/4/1”, areentered in the selected order (i.e., “My Cat” first and then “Food”).Additionally, only link information to the file information folder “Food2”, which is one of the file information folders “Food” and “Food 2”corresponding to the file stored in the folder “2005/4/1”, is entered inthe still image playlist folder.

Accordingly, in this example, when the images in the video playlistfolder are played back, the image groups of the video files DMFxcorresponding to “My Cat” and “Food” are sequentially played back (i.e.,“My Cat” first and then “Food”). In contrast, when the image in thestill image playlist folder is played back, the images associated withthe still image files DJFy corresponding to “Food 2” are played back.

As noted above, only the link information to files selected by the useras files to be sequentially played back from among the link informationto files, each corresponding to one or more scenes grouped on the basisof date, are entered into the playback folder in the order of selection(i.e., in the order of entry) for each type.

When physically recorded on the storage medium SM, the actual filestructure of the image management file is shown in FIG. 3. That is, theimage management file includes a property file, a thumbnail file, and ameta data file. The reference relationship among registered entries inthe property file is schematically shown in FIG. 2.

In this property file, an entry “#4” is related to a video playlist. Inthis embodiment, the identifiers of the entries #21 and #24 for videofiles are stored in this entry. An entry “#5” is related to a stillimage playlist. In this embodiment, the identifier of the still imagefile entry #22 is stored in this entry. In the entries for the videofile and the still image file, path information used for accessing thecorresponding thumbnail image (e.g., “A”, “B”, or “C”) in the thumbnailpicture file and path information used for accessing the correspondingmeta data (e.g., “Food” or “My Cat”) in the meta data file are stored.Additionally, an entry “#20” stores the identifiers of the entries for avideo file and a still image file captured on “2005/4/1”. Here, thevideo file entry #21 and the still image file entry #22 are indicated bythe identifiers. An entry “#23” stores identifiers of an entry for avideo file and a still image file captured on “2005/4/5”. Here, thevideo file entry #24 is indicated by the identifier.

(2-2) Entry Processing

The entry processing for the above-described image management file isperformed by the control unit 2. This entry processing performed by thecontrol unit 2 (see FIG. 1) is described below for the date folder, thefile information folder, and the playlist folder.

(2-2-1) Entry Processing for Date Folder and File Information Folder

When detecting that the video capture start operation or the still imagecapture start operation is to be carried out, the control unit 2controls the image capturing unit 4 and the recording/playback unit 5.In addition, the control unit 2 controls the clock unit 7 to acquire thedate on which the control unit 2 detects initiation of the startoperation as data DT (hereinafter referred to as “date data”).

Here, the control unit 2 references the image management file stored onthe storage medium SM using the recording/playback unit 5. If a folderhaving a title name based on the date data DT is not found, the controlunit 2 creates a folder having a title name based on the date data DT.In addition, the control unit 2 creates a file information folder havinga title name based on a default character string. The control unit 2then enters these folders in the image management file.

However, if a folder having a title name based on the date data DT isfound, the control unit 2 creates only a file information folder. Thecontrol unit 2 then enters this folder in the image management file.

Note that if an image management file has not been recorded on thestorage medium SM, the control unit 2 creates a root directory, anoriginal folder, a favorite folder, a video playlist folder, and a stillimage playlist folder on the storage medium SM as an initial imagemanagement file.

In addition, after the entry operation of the file information folder ismade, if video data (i.e., image data items DM1 to DMn) are deliveredfrom the image capturing unit 4 in response to the control of the imagecapturing unit 4, the control unit 2 reduces, for example, the firstimage data DM1 to a predetermined image size. This reduced image is usedas a thumbnail image.

In contrast, if still image data (i.e., image data DJ) is delivered fromthe image capturing unit 4, the control unit 2 reduces the image data DJto a predetermined image size. This reduced image is used as a thumbnailimage.

Subsequently, the control unit 2 stores the reduced image data(hereinafter referred to as “thumbnail image data”) in the fileinformation folder and also stores the file identifier of this file.

In this way, the control unit 2 can automatically group the files on acapture date basis for each type of file.

(2-2-2) Entry Processing for Playlist Folder

Upon detecting the entry operation to the playlist folder, the controlunit 2 controls the image capturing unit 4 and the recording/playbackunit 5 to display a selection screen CS shown in FIG. 4 on the basis ofthe image management file recorded on the storage medium SM.

More specifically, the control unit 2 starts entry processing of theplaylist folder (step SP0 shown in FIG. 5). First, the control unit 2displays menu items (i.e., “VIDEO”, “STILL IMAGE”, and “PLAYLIST”).Simultaneously, the control unit 2 selects the “VIDEO” menu item bydefault and displays a detailed video menu items in a detail displaysection 10 used for displaying the details of the selected menu item.

Subsequently, the control unit 2 displays one or more thumbnail imagesstored in an image-related folder in the lower layer of the date folderin an image display section 11, which is located in the middle of thedetail display section 10. In addition, the control unit 2 displays theearliest date among the dates of the corresponding date folders in adate display section 12, which is provided above the image displaysection 11.

Furthermore, if all of the thumbnail images cannot be displayed in theimage display section 11 at the same time, the control unit 2 changes ascroll operation section 13 used for scrolling the thumbnail imagesdisplayed in the image display section 11 from an inactive displaystate, which represents an unusable state, to an active display state,which represents a usable state. Simultaneously, the control unit 2displays the total number of scrollable pages and the page number of thecurrently displayed page in a page display section 14.

For example, suppose, as shown in FIG. 6A, seventeen scenes are capturedon some day (i.e., a date (1)) first, and then twelve scenes arecaptured on a date (2). Thereafter, five scenes are captured on a date(3). In such a case, the control unit 2 does not display any image atthe location for the nonexistent eighteenth scene of the date (1), whichis on the third page for the date (1), instead of displaying thethumbnail image of the first scene of the date (2). Thus, the space atthat location is left blank. Similarly, the control unit 2 does notdisplay any image at the location for the nonexistent sixth scene of thedate (3), which is on the first page for the date (3), instead ofdisplaying the thumbnail image of the first scene of the date (4) to becaptured later. Thus, the space at that location is left blank.

As noted above, by displaying the thumbnail images in the order ofoldest to newest on a capture date basis via the selection screen CS,the control unit 2 can visually emphasize that the scenes are displayedon a capture date basis (i.e., on an event-to-event basis).

Thus, the control unit 2 switches the display of the detail displaysection 10 between the “video” menu items and the “still image” menuitems in response to the user operation on the operation unit 3 (seeFIG. 1), so that the user can select the entry in the video playlistfolder or in the still image playlist folder (step SP1 in FIG. 5).

For example, upon detecting that the user has instructed setting of aplaylist by operating a menu button when the detail display section 10displays the video menu items, the control unit 2 determines that theentry of the video playlist folder is selected. Subsequently, as shownin FIG. 7, the control unit 2 displays an edit menu screen EMS includingthree edit menu items “Select and register image in the playlist”,“Register images in playlist on a capture date basis”, and “Register allimages in playlist”, and a selection cursor CL1 for selecting one ofthese three edit menu items.

Here, upon detecting that the edit menu item “Register images inplaylist on a capture date basis” is selected, the control unit 2determines that the video playlist folder is selected. Subsequently, asshown in FIG. 8, by displaying a screen (hereinafter referred to as a“date selection screen”) CSD including the list of the date foldersentered in the lower layers of the original root folder in the order ofoldest to newest in the detail display section 10 together with aselection cursor CL2 for selecting the date, the control unit 2 allowsthe user to select the date to be added to the video playlist folder(step SP2 in FIG. 5).

Thereafter, upon detecting that the selection operation of the date hasbeen carried out, the control unit 2 displays a confirmation screen CSXshown in FIG. 9 in the detail display section 10 in order to determinewhether the control unit 2 is allowed to add the image having theselected date to the playlist. Upon detecting initiation of theoperation to add the image to the playlist, the control unit 2sequentially creates the entries of the link information to all the fileinformation folders in the lower layer of the date folder having theselected date of scene in the order of oldest to newest in the videoplaylist folder (step SP3 in FIG. 5).

At that time, if link information to a different file information folderhas already been entered in the video playlist folder, the control unit2 creates the entry of the link information to be entered next to theexisting link information.

Additionally, as shown in FIG. 10, simultaneously with this entry, thecontrol unit 2 displays the detailed playlist menu items in the detaildisplay section 10 and displays a thumbnail image corresponding to theselected date in the image display section 11 of the detail displaysection 10. Thereafter, the entry processing of the playlist folder iscompleted (step SP4 in FIG. 5).

In the example shown in FIG. 6A, when the date (2) is selected, thecontrol unit 2 enters link information to the file information foldershaving the date (2) in the video playlist folder in the order ofearliest time of the scene first, as shown in FIG. 6B. Also, the controlunit 2 displays the thumbnail images corresponding to the date (2) inthe detail display section 10 as a playlist screen.

In contrast, upon detecting that the edit item “Select and registerimage in the playlist” is selected, the control unit 2 prompts the userto select the date to be added to the video playlist folder via the dateselection screen CSD (see FIG. 8). Thereafter, the control unit 2displays a selection cursor (not shown) for selecting a thumbnail imagehaving the selected date in the image display section 11. Thus, the userselects individual thumbnail images in the image display section 11. Thecontrol unit 2 puts entries of the link information to the fileinformation folders corresponding to the selected thumbnail images inthe video playlist folder. Simultaneously, the control unit 2 displaysthe selected thumbnail images in the detail display section 10 as aplaylist screen.

At that time, if link information to a different file information folderhas already been entered in the video playlist folder, the control unit2 creates the entry of the link information to be entered next to theexisting link information, as in the case of “Register images inplaylist on a capture date basis”.

However, upon detecting that the edit item “Register all images inplaylist” is selected, the control unit 2 puts entries of linkinformation to all the file information folders in the lower layers ofthe one or more date folders in the video play list folder in the orderof oldest to newest of the scene. Also, the control unit 2 displays allthe thumbnail images in the detail display section 10 as a playlistscreen.

At that time, if link information to a different file information folderhas already been entered in the video playlist folder, the control unit2 creates the entry of the link information to be entered next to theexisting link information, as in the case of “Select and register imagein playlist”.

Additionally, if the control unit 2 detects that the entry operation ofthe playlist is carried out after the “video” menu items has beenchanged to the “still image” menu items in the detail display section10, the control unit 2 puts entries of link information to the selectedfile information folder in the still image playlist folder, as in theentry operation relating to the “video”.

In this way, the control unit 2 can further categorize the filesautomatically grouped on a capture date basis into different groups inresponse to performance of the selection operation instructed by theuser. That is, in addition to an image-to-image basis and an all-imagebasis, the group can be created on a capture date basis, which issuitable for remembering a personal event, for each type of file.

Accordingly, for the video camera 1, the user can group the files on anevent-to-event basis using a date. In addition, the user can furthergroup the files that the user frequently wants to view. Thus, the usercan select and keep the files for the event that the user frequentlywants to view. However, the user can also keep the other files for theevent just in case the user wishes to view them.

(2-2-3) Edit Operation of Playlist Folder

The edit operation of a playlist folder performed by the control unit 2is described next. However, since the edit operation of a still imageplaylist folder is similar to that of a video playlist folder, only theedit operation of a video playlist folder is described here.

Upon detecting that the edit operation of a video playlist is to becarried out, the control unit 2 displays menu items “video”, “stillimage”, and “playlist”. In addition, the control unit 2 displaysdetailed playlist menus in the detail display section 10, as shown inFIG. 11. Note that the same reference numerals are used in both FIGS. 3and 11 to identify the same elements.

Subsequently, the control unit 2 displays one or more thumbnail imagesstored in a file information folder entered in the video playlist in animage display section 11, which is located in the middle of the detaildisplay section 10, in the order of earliest entry first. In addition,the control unit 2 displays the selection cursor CL2 for selecting oneof the thumbnail images.

For example, if the first entry of the video playlist is based on acapture date basis, the control unit 2 displays thumbnail images storedin the file information folder, which is entered on a capture datebasis, in the image display section 11. At that time, if all of thethumbnail images cannot be displayed in the image display section 11 atthe same time, the control unit 2 changes the scroll operation section13 to an active display state and displays the total number ofscrollable pages and the page number of the currently displayed page inthe page display section 14.

For example, in FIG. 11, eleven thumbnail images indicated by the linkinformation in the first entry of the video playlist folder are shown.As can be seen from FIG. 11, the control unit 2 does not display anyimage in a space corresponding to the twelfth image position on page 2in the image display section 11, instead of displaying the thumbnailimage indicated by the link information in the second entry of the videoplaylist folder. Thus, the space at that position is left blank. In thisway, the control unit 2 visually emphasizes that the thumbnail imagesare displayed on a capture date basis while displaying the thumbnailimages in the order of oldest to newest.

At that time, upon detecting that a delete operation is to be carriedout, the control unit 2 deletes the link information to the fileinformation folder corresponding to the thumbnail image selected bymeans of the selection cursor CL2 from the video playlist folder.

In contrast, upon detecting that a change operation of the entry orderis to be carried out, the control unit 2 prompts the user to select twothumbnail images to be exchanged by means of the selection cursor CL2.Thereafter, the control unit 2 changes the entry orders of the linkinformation corresponding to the selected thumbnail images.

Thus, the control unit 2 can edit the files grouped for successiveplayback in response to the selection operation performed by the user.

In this way, for the video camera 1, the user can further categorize thefiles grouped on a capture date basis for each personal event intodifferent groups of files that the user frequently wants to view.Furthermore, by appropriately changing the order in which the files areplayed back or deleting the file, the user can view the video thatmatches their preference.

Here, for example, suppose a user shoots a video at personal events suchas an athletic meet and a Christmas party using the video camera 1. Inthis case, the captured images (scenes) are automatically grouped on thebasis of the date (the date of the athletic meet or the date of theChristmas party) in the order of oldest to newest. After the scenes arecaptured, the user can group the images corresponding to the scenes thatcontain their child as images to be successively played back andappropriately edit the images. Thus, the user can view successivelyplayed back images (i.e., video) that mainly shows their child.

(2-2-4) Transfer Process of Playlist

The transfer process of a playlist performed by the control unit 2 isdescribed next. However, since the transfer process of a still imageplaylist folder is similar to that of a video playlist folder, only thetransfer process of a video playlist folder is described here.

Upon detecting that the transfer operation of a video playlist is to becarried out, the control unit 2 references the targets indicated by thelink information in all the entries of the video playlist folder so asto arrange the thumbnail images stored in the file information foldersin the order of selection. Thus, the control unit 2 generates displaydata shown in the image display section 11 of FIG. 11.

Subsequently, the control unit 2 transmits the display data togetherwith the video files DMFx corresponding to the thumbnail images of thedisplay data to, for example, a personal computer via an interface (notshown). The display data can be used as information items of thepersonal event on a web page or index data when a video is recorded on adigital versatile disc (DVD).

As noted above, the control unit 2 can transfer the display data usedfor information items of the personal event on a web page or index datawhen a video is recorded on a digital versatile disc (DVD) to, forexample, a personal computer that edits the video on the basis of theplaylist.

(3) Summary

In the above-described configuration, the video camera 1 records animage captured when a still image capture operation is carried out onthe storage medium SM as a still image file DJFy (see FIG. 1). Inaddition, the video camera 1 records a plurality of images captured fromthe time when a video capture start operation is carried out to the timewhen a video capture end operation is carried out on the storage mediumSM as a video file DMFx (see FIG. 1).

Here, the video camera 1 has a function of making an entry (see FIG. 2)of the identifier of the video file DMFx or the still image file DJFy ona capture date basis in the order of capture time each time the file isrecorded on the storage medium SM.

Accordingly, the video camera 1 can automatically group the files on acapture date basis for each type of file. In general, personal eventsoccur on the basis of a date. Therefore, the files can be effectivelymanaged compared with simply recording on a scene-to-scene basis. Thus,the ease of use at a playback time can be increased.

Furthermore, in the image management file, the file identifier of a fileand the thumbnail image of the file are entered on a capture date basisin the order of capture time. In addition, the video camera 1 has afunction of displaying the selection screen CS (see FIG. 4) forselecting the files recorded on the storage medium SM on a capture datebasis using the thumbnail images and the edit menu screen EMS (see FIG.7) on the display unit 6. This function allows the identifier of thevideo file DMFx or the still image file DJFy having the date that is thesame as the date selected via the displayed screen and the thumbnailimage corresponding to the file to be entered in the order of selection.

Accordingly, the video camera 1 can further categorize the filesautomatically grouped on a capture date basis into a different group inresponse to the selection operation performed by a user. Therefore, theuser can effectively manage the files while keeping the management onthe basis of a date. Thus, the ease of use at a playback time can befurther increased.

Additionally, since the video camera 1 stores the thumbnail images inthe image management file, the control unit 2 can decrease the timerequired for finding the desired thumbnail image compared with thedesign in which the thumbnail images are placed in an area other thanthe image management file. As a result, the video camera 1 can decreasethe time required for displaying the selection screen CS (see FIG. 4) onthe display unit 6 on the basis of the thumbnail images. Thus, the timea user is required to wait before the screen appears can be decreased.

Furthermore, the video camera 1 has a function of deleting some of theidentifiers and thumbnail images having a predetermined date and beingentered in the order of selection in response to performance of theselection operation instructed by the user. Alternatively, the videocamera 1 has a function of changing the order of selection.

Accordingly, the video camera 1 can edit the files grouped in accordancewith performance of the selection operation instructed by the user.Thus, the user can further manage the files depending on the user'spreference.

According to the above-described configuration, each time the video fileDMFx or the still image file DJFy is recorded on the storage medium SM,the identifier of that file is entered (see FIG. 2) in the imagemanagement file on a capture date basis in the order of capture time.Therefore, the video camera 1 can automatically group the files on acapture date basis for each type of file. In general, personal eventsoccur on the basis of a date. Therefore, the video camera 1 caneffectively manage the files recorded on the storage medium SM so as tobe friendly to users.

(4) Other Exemplary Embodiments

In the above-described exemplary embodiments, when the edit item“register images in the playlist on a capture date basis” is selected inthe edit menu screen EMS (see FIG. 7), the date selection screen CSD(see FIG. 8) of the entered date is displayed. Thereafter, it is askedwhether an image having the date selected via the date selection screenCSD is added to the playlist using the confirmation screen CSX (see FIG.9). However, the present invention is not limited thereto.Alternatively, when the selection operation is performed, it may beconsidered that the date displayed in the date display section 12 atthat time is selected. Thus, it may be asked whether an image havingthat date is added to the playlist using the confirmation screen CSX(see FIG. 9).

Additionally, in the above-described exemplary embodiments, one videoplaylist and one still image playlist are created in the lower layer ofthe favorite folder in the image management file (see FIG. 2). However,the present invention is not limited thereto. Alternatively, theseplaylists may be created in response to the setting operation performedby a user.

More specifically, before the control unit 2 makes an entry in the fileinformation folder in the video playlist folder or the still imageplaylist folder, the control unit 2 may display a screen on the displayunit 6 for prompting a user to select whether the existing playlist or anewly created playlist is entered. On the basis of the selection result,the control unit 2 can make the entry in the target file informationfolder.

In this way, a playlist that further meets the user's preference can becreated compared with the above-described embodiment in which theplaylist is simply separated depending on the type of file.

Furthermore, in the above-described exemplary embodiments, the presentinvention is applied to the video camera 1. However, the presentinvention is applicable to a variety of image recording apparatuses,image playback apparatuses, or image recording/playback apparatuseshaving a function of processing an image. Examples of such apparatusesinclude a personal computer, a personal digital assistant (PDA), a harddisk recorder (HDR), and a digital still camera.

It should be understood by those skilled in the art that variousmodifications, combinations, sub-combinations and alterations may occurdepending on design requirements and other factors insofar as they arewithin the scope of the appended claims or the equivalents thereof.

What is claimed is:
 1. An image playback apparatus comprising: anarranging unit to arrange sequentially a plurality of thumbnail imagesof image files on a capture date basis; and a display control unit tocontrol: display of the plurality of thumbnail images, wherein thethumbnail images corresponding to different capture dates are displayedseparately, scrolling the display of the plurality of thumbnail imagesarranged on a capture date in accordance with the different capturedates, in which the scrolling scrolls across a display section at leastone thumbnail image corresponding to a first capture date of thedifferent captures dates followed next by at least one thumbnail imagecorresponding to a second capture date of the different capture dates,the thumbnail images corresponding respectively to the different capturedates being displayed separately during the scrolling such that a sameline on the display section for display of thumbnail images does notinclude a thumbnail image corresponding to the first capture date and athumbnail image corresponding to a capture date different from the firstcapture date, and display a screen for selection by a user of a capturedate of the different capture dates in the display section in which theplurality of thumbnail images is displayed.
 2. The image playbackapparatus according to claim 1, wherein the display control unit is toarrange the thumbnail images having a same capture date in lines, andwhen a last line of the lines is available for arranging the thumbnailimages having the same capture date and there is no further unarrangedthumbnail image having the same capture date, not to display in the lastline the thumbnail images having a capture date different from the samecapture date.
 3. The image playback apparatus according to claim 2,wherein the display control unit, when a location of the last line isavailable for arranging the thumbnail images having the same capturedate and there is no further unarranged thumbnail image having the samecapture date, is not to display in the last line the thumbnail imageshaving a capture date different from the same capture date and to leavethe location blank.
 4. The image playback apparatus according to claim3, wherein the display control unit is to display a position of acurrently displayed page within a plurality of pages.
 5. The imageplayback apparatus according to claim 4, wherein the display controlunit is to change a scroll operation section to an active display stateif all of the thumbnail images having the same capture date cannot bedisplayed on a same page.
 6. The image playback apparatus of claim 1,wherein the display control unit is to control successive play back ofimages on a capture date basis based on selection of a thumbnail of theplurality of thumbnails displayed on a capture date basis.
 7. The imageplayback apparatus of claim 1 further comprising: a control unit tocontrol transfer to an external device, via an interface, of the imagefiles on a capture date basis.
 8. A method for displaying an imagecomprising: arranging sequentially a plurality of thumbnail images ofimage files on a capture date basis; displaying the plurality ofthumbnail images, wherein the thumbnail images corresponding todifferent capture dates are displayed separately; scrolling the displayof the plurality of thumbnail images arranged on a capture date inaccordance with the different capture dates, in which the scrollingscrolls across a display section at least one thumbnail imagecorresponding to a first capture date of the different captures datesfollowed next by at least one thumbnail image corresponding to a secondcapture date of the different capture dates, the thumbnail imagescorresponding respectively to the different capture dates beingdisplayed separately during the scrolling such that a same line on thedisplay section for display of thumbnail images does not include athumbnail image corresponding to the first capture date and a thumbnailimage corresponding to a capture date different from the first capturedate; and displaying a screen for selection by a user of a capture dateof the different capture dates in the display section in which theplurality of thumbnail images is displayed.
 9. The method for displayingan image according to claim 8 further comprising: arranging thethumbnail images having a same capture date in lines, and when a lastline of the lines is available for arranging the thumbnail images havingthe same capture date and there is no further unarranged thumbnail imagehaving the same capture date, not displaying in the last line thethumbnail images having a capture date different from the same capturedate.
 10. The method for displaying an image according to claim 9,wherein, when a location of the last line is available for arranging thethumbnail images having the same capture date and there is no furtherunarranged thumbnail image having the same capture date, not displayingin the last line the thumbnail images having a capture date differentfrom the same capture date and leaving the location blank.
 11. Themethod for displaying an image according to claim 10 further comprising:displaying a position of a currently displayed page within a pluralityof pages.
 12. The method for displaying an image according to claim 11further comprising: changing a scroll operation section to an activedisplay state if all of the thumbnail images having the same capturedate cannot be displayed on a same page.
 13. A non-transitory recordingmedium recorded with a program executable by a computer, the programcomprising: arranging sequentially a plurality of thumbnail images ofimage files on a capture date basis; displaying the plurality ofthumbnail images, wherein the thumbnail images corresponding todifferent capture dates are displayed separately; scrolling the displayof the plurality of thumbnail images arranged on a capture date inaccordance with the different capture dates, in which the scrollingscrolls across a display section at least one thumbnail imagecorresponding to a first capture date of the different captures datesfollowed next by at least one thumbnail image corresponding to a secondcapture date of the different capture dates, the thumbnail imagescorresponding respectively to the different capture dates beingdisplayed separately during the scrolling such that a same line on thedisplay section for display of thumbnail images does not include athumbnail image corresponding to the first capture date and a thumbnailimage corresponding to a capture date different from the first capturedate; and displaying a screen for selection by a user of a capture dateof the different capture dates in the display section in which theplurality of thumbnail images is displayed.
 14. The non-transitoryrecording medium according to claim 13, the program further comprising:arranging the thumbnail images having a same capture date in lines, andwhen a last line of the lines is available for arranging the thumbnailimages having the same capture date and there is no further unarrangedthumbnail image having the same capture date, not displaying in the lastline the thumbnail images having a capture date different from the samecapture date.
 15. The non-transitory recording medium according to claim14, the program further comprising: when a location of the last line isavailable for arranging the thumbnail images having the same capturedate and there is no further unarranged thumbnail image having the samecapture date, not displaying in the last line the thumbnail imageshaving a capture date different from the same capture date and leavingthe location blank.
 16. The non-transitory recording medium according toclaim 15, the program further comprising: displaying a position of acurrently displayed page within a plurality of pages.
 17. Thenon-transitory recording medium according to claim 16, the programfurther comprising: changing a scroll operation section to an activedisplay state if all of the thumbnail images having the same capturedate cannot be displayed on a same page.